How can I remove vibration when the phone is turned off on my Samsung Galaxy S9 (non-rooted Android 9, One UI 1.0)?
I don't have any option item
Settings app > Accessibility > Vibration.
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This is option is not for user’s control. It’s default for all smartphones.
The main purpose is to alert the user when their phone shuts down otherwise there is a chance that users may not know whether their phone is off or on.
So OEM provides this feature as default and cannot be controlled until the phone is rooted. Rooting a phone will give you a full control over the phone. But this is helpful. If you feel to remove this option, root your device but that is difficult fix to this. Mainly it is not a bug.
Hope it helps!